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/*
* IS-IS Rout(e)ing protocol - LSP TX Queuing logic
*
* Copyright (C) 2018 Christian Franke
*
* This file is part of FRRouting (FRR)
*
* FRR is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2, or (at your option) any
* later version.
*
* FRR is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; see the file COPYING; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <zebra.h>
#include "hash.h"
#include "jhash.h"
#include "isisd/isisd.h"
#include "isisd/isis_memory.h"
#include "isisd/isis_flags.h"
#include "isisd/isis_circuit.h"
#include "isisd/isis_lsp.h"
#include "isisd/isis_misc.h"
#include "isisd/isis_tx_queue.h"
DEFINE_MTYPE_STATIC(ISISD, TX_QUEUE, "ISIS TX Queue")
DEFINE_MTYPE_STATIC(ISISD, TX_QUEUE_ENTRY, "ISIS TX Queue Entry")
struct isis_tx_queue {
struct isis_circuit *circuit;
void (*send_event)(struct isis_circuit *circuit,
struct isis_lsp *, enum isis_tx_type);
struct hash *hash;
};
struct isis_tx_queue_entry {
struct isis_lsp *lsp;
enum isis_tx_type type;
bool is_retry;
struct thread *retry;
struct isis_tx_queue *queue;
};
static unsigned tx_queue_hash_key(const void *p)
{
const struct isis_tx_queue_entry *e = p;
uint32_t id_key = jhash(e->lsp->hdr.lsp_id,
ISIS_SYS_ID_LEN + 2, 0x55aa5a5a);
return jhash_1word(e->lsp->level, id_key);
}
static bool tx_queue_hash_cmp(const void *a, const void *b)
{
const struct isis_tx_queue_entry *ea = a, *eb = b;
if (ea->lsp->level != eb->lsp->level)
return false;
if (memcmp(ea->lsp->hdr.lsp_id, eb->lsp->hdr.lsp_id,
ISIS_SYS_ID_LEN + 2))
return false;
return true;
}
struct isis_tx_queue *isis_tx_queue_new(
struct isis_circuit *circuit,
void(*send_event)(struct isis_circuit *circuit,
struct isis_lsp *,
enum isis_tx_type))
{
struct isis_tx_queue *rv = XCALLOC(MTYPE_TX_QUEUE, sizeof(*rv));
rv->circuit = circuit;
rv->send_event = send_event;
rv->hash = hash_create(tx_queue_hash_key, tx_queue_hash_cmp, NULL);
return rv;
}
static void tx_queue_element_free(void *element)
{
struct isis_tx_queue_entry *e = element;
if (e->retry)
thread_cancel(e->retry);
XFREE(MTYPE_TX_QUEUE_ENTRY, e);
}
void isis_tx_queue_free(struct isis_tx_queue *queue)
{
hash_clean(queue->hash, tx_queue_element_free);
hash_free(queue->hash);
XFREE(MTYPE_TX_QUEUE, queue);
}
static struct isis_tx_queue_entry *tx_queue_find(struct isis_tx_queue *queue,
struct isis_lsp *lsp)
{
struct isis_tx_queue_entry e = {
.lsp = lsp
};
return hash_lookup(queue->hash, &e);
}
static int tx_queue_send_event(struct thread *thread)
{
struct isis_tx_queue_entry *e = THREAD_ARG(thread);
struct isis_tx_queue *queue = e->queue;
e->retry = NULL;
thread_add_timer(master, tx_queue_send_event, e, 5, &e->retry);
if (e->is_retry)
queue->circuit->area->lsp_rxmt_count++;
else
e->is_retry = true;
queue->send_event(queue->circuit, e->lsp, e->type);
/* Don't access e here anymore, send_event might have destroyed it */
return 0;
}
void _isis_tx_queue_add(struct isis_tx_queue *queue,
struct isis_lsp *lsp,
enum isis_tx_type type,
const char *func, const char *file,
int line)
{
if (!queue)
return;
if (isis->debugs & DEBUG_TX_QUEUE) {
zlog_debug("Add LSP %s to %s queue as %s LSP. (From %s %s:%d)",
rawlspid_print(lsp->hdr.lsp_id),
queue->circuit->interface->name,
(type == TX_LSP_CIRCUIT_SCOPED) ?
"circuit scoped" : "regular",
func, file, line);
}
struct isis_tx_queue_entry *e = tx_queue_find(queue, lsp);
if (!e) {
e = XCALLOC(MTYPE_TX_QUEUE_ENTRY, sizeof(*e));
e->lsp = lsp;
e->queue = queue;
struct isis_tx_queue_entry *inserted;
inserted = hash_get(queue->hash, e, hash_alloc_intern);
assert(inserted == e);
}
e->type = type;
if (e->retry)
thread_cancel(e->retry);
thread_add_event(master, tx_queue_send_event, e, 0, &e->retry);
e->is_retry = false;
}
void _isis_tx_queue_del(struct isis_tx_queue *queue, struct isis_lsp *lsp,
const char *func, const char *file, int line)
{
if (!queue)
return;
struct isis_tx_queue_entry *e = tx_queue_find(queue, lsp);
if (!e)
return;
if (isis->debugs & DEBUG_TX_QUEUE) {
zlog_debug("Remove LSP %s from %s queue. (From %s %s:%d)",
rawlspid_print(lsp->hdr.lsp_id),
queue->circuit->interface->name,
func, file, line);
}
if (e->retry)
thread_cancel(e->retry);
hash_release(queue->hash, e);
XFREE(MTYPE_TX_QUEUE_ENTRY, e);
}
unsigned long isis_tx_queue_len(struct isis_tx_queue *queue)
{
if (!queue)
return 0;
return hashcount(queue->hash);
}
void isis_tx_queue_clean(struct isis_tx_queue *queue)
{
hash_clean(queue->hash, tx_queue_element_free);
}
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